When comparing No Man's Sky vs Grim Dawn, the Slant community recommends Grim Dawn for most people. In the question“What are the best indie games on Steam?”Grim Dawn is ranked 23rd while No Man's Sky is ranked 63rd. The most important reason people chose Grim Dawn is:

Basically you choose 1 class and select skills as you level up. At level 10 you can select a second class, which already gives you 5x5=25 character type possibilities.
Each character has dozens of skills, plus you have this additional passive skill tree that you unlock through cleansing shrines. Then there is item customization with crafted "modifiers", adding additional unique stats and skills that you can use, all this adds literally to thousands / millions of character possibilities.
Do you want to use a double weapon shooting lightning bolts? You can do that. Do you want to summon your creatures and support them with fireballs? You can do that as well, you can push it wherever you want.

Pros

Pro

Freedom to choose how you want to play

Ally with factions, trade or just be a pirate. When trading with NPC aliens, you build up a positive reputation with the faction they belong to. Alternatively you can also be hostile and attack trade ships, or even be attacked by NPC pirate spaceships. Both can be ways to get what you need, so do whatever suits your play style.

Pro

Endless procedural generation

This game procedurally generates almost everything. Your spaceships are procedurally generated, so are the planets, moons, every animal on these planets, the resource nodes, trade routes, languages, etc. When discovering new species or planets, players get to rename these and leave their mark on the galaxy.

Pro

Good graphics

The art style of this game is very colorful and saturated and uses hues in a way that it gives you an otherworldly feel. Graphics like these tend to remain good for a much longer time than classic 3D graphics.

Pro

Seamless space to planetary flight

Pro

Massive galaxy to explore

Thanks to the fact that the entire galaxy of No Man's Sky is procedurally generated, the amount of planets to explore is almost endless. The number of planets would be 18,446,744,073,709,551,616. However, the fact that 2 players managed to find each other in game on the first day, seems to make this number quite questionable.

Pro

Complex leveling system with thousands of possible builds

Basically you choose 1 class and select skills as you level up. At level 10 you can select a second class, which already gives you 5x5=25 character type possibilities.

Each character has dozens of skills, plus you have this additional passive skill tree that you unlock through cleansing shrines. Then there is item customization with crafted "modifiers", adding additional unique stats and skills that you can use, all this adds literally to thousands / millions of character possibilities.

Do you want to use a double weapon shooting lightning bolts? You can do that. Do you want to summon your creatures and support them with fireballs? You can do that as well, you can push it wherever you want.

Pro

Great homage to old school ARPGs

This game is very dark, and grim. It harkens back to games like Diablo 2 or Titans Quest. While other ARPGs have come out since then, none have hit all the marks of what fans of the genre have been asking for. For those that wish for an updated version of Diablo 2, Grim Dawn is the game for them.

Pro

Drop-in co-op (online and local)

Co-op is pretty convenient as players can drop in and out of your gaming session at any time. This way there is no wasted time jumping out of ones game in order to find players to play with.

Pro

Exploration

Cons

Con

No clearly defined missions

The objective of the game is to ultimately reach the center of the galaxy. However, the player is completely free and unguided from the beginning. You figure it out for yourself as you start mining, crafting and upgrading your ship and gear. This game doesn't have a big story to tell.

Con

Expensive

No Man's Sky is a pretty big production for an indie game as the team of devs and artists consisted of 14 people in the later stages of development. The game stands out above most indie games in size, features, technology and graphics. Along with the amount of enthusiasm from the gaming community, this has allowed the studio to set the launch price at $60 (or €60).

Con

Difficult to move when fighting, especially when you are ranged

Con

Static pre-rendered levels

This may cut down on replayability a bit as all the levels in the game are pre-rendered, meaning that each playthrough will have the exact same layout, making for something that can get tiring and too familiar. Similar games have gone with randomized levels, which can keep the game fresh. While Grim Dawn is meant to be a throwback to earlier games in the genre, some newer features found in more recent released would have been welcome.

Con

Lots of trips to town

The majority of loot in the game can be useless, with odd stat restrictions or repeats of vendor items. This means the user will need to make many trips into town to sell it all off in order to have room for even more loot they will not necessarily need.